From 0dfb289a3b362b082ac3608d887e42f09dadc0d2 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Date: Mon, 31 Dec 2018 16:22:07 +0100
Subject: [PATCH] Properly detect the availability of pthread_setname_np()

This commit adds a CMake check for the availability of
pthread_setname_np(), and only uses it on Linux when available.

Indeed, some C libraries, such as uClibc, do not provide this
non-POSIX function in all cases.

Upstream: https://github.com/grpc/grpc/pull/17610
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

[buildroot@heine.tech:
  1.42.0 added new logic to handle older glibc without pthread_setname_np()
  but is still not sufficient for all cases. So alter the patch to wrap all
  this with our cmake based workaround.
  See: https://github.com/grpc/grpc/pull/27540
]
Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
---
 CMakeLists.txt                            | 6 ++++++
 include/grpc/impl/codegen/port_platform.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 45c2fcb..0b2be4f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -208,6 +208,12 @@ if (NOT DEFINED CMAKE_POSITION_INDEPENDENT_CODE)
 endif()
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
 
+include(CheckSymbolExists)
+check_symbol_exists(pthread_setname_np pthread.h HAVE_PTHREAD_SETNAME_NP)
+if (HAVE_PTHREAD_SETNAME_NP)
+  add_definitions(-DHAVE_PTHREAD_SETNAME_NP)
+endif ()
+
 if(MSVC)
   include(cmake/msvc_static_runtime.cmake)
   add_definitions(-D_WIN32_WINNT=0x600 -D_SCL_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS -D_WINSOCK_DEPRECATED_NO_WARNINGS)
diff --git a/include/grpc/impl/codegen/port_platform.h b/include/grpc/impl/codegen/port_platform.h
index 4f213ff..55ecd9d 100644
--- a/include/grpc/impl/codegen/port_platform.h
+++ b/include/grpc/impl/codegen/port_platform.h
@@ -186,6 +186,7 @@
 #endif /* _LP64 */
 #ifdef __GLIBC__
 #define GPR_POSIX_CRASH_HANDLER 1
+#if defined(HAVE_PTHREAD_SETNAME_NP)
 #ifdef __GLIBC_PREREQ
 #if __GLIBC_PREREQ(2, 12)
 #define GPR_LINUX_PTHREAD_NAME 1
@@ -194,6 +195,7 @@
 // musl libc & others
 #define GPR_LINUX_PTHREAD_NAME 1
 #endif
+#endif /* HAVE_PTHREAD_SETNAME_NP */
 #include <linux/version.h>
 #else /* musl libc */
 #define GPR_MUSL_LIBC_COMPAT 1

-- 
2.26.63
